Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium

Massai Harouna; Constant Tcheka; Narcisse Dobe

doi:doi:10.11648/j.mc.20200802.12

| Peer-Reviewed

Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium

Massai Harouna, Constant Tcheka, Narcisse Dobe

Published in Modern Chemistry (Volume 8, Issue 2)

Received: 29 July 2020 Accepted: 19 August 2020 Published: 27 August 2020

Views: Downloads:

Download PDF

Share This Article

Twitter
Linked In
Facebook

Abstract

The present work report removal of acid red 14 (AR14) and basic violet 3 (BV3) as anionic and cationic dyes, respectively, by adsorption process in batch mode from aqueous solution onto natural and modified forms of a local Cameroonian clay. The efficiency of these adsorbents materials (purified natural clay, P−Clay, sodium−clay, Na−Clay, and aluminium−pillared, Al−PILC) to remove dyes from aqueous medium was examined at different initial concentrations, pH, and ionic strengths. At the optimal contact time of 20 minutes, the maximum adsorbed dye amount on various adsorbents was obtained at pH 9 and pH 3 for AR14 and BV3 dyes, respectively. Adsorption process of both dyes on purified or modified clay was pH depend and the dyes molecules sorption over the clay surface occurs by electrostatic interactions. Ionic strength influenced significantly AR14 and BV3 dyes adsorption. Homo-ionization and pillaring clay increased its adsorption capacity. Kinetic studies showed that adsorption follows a pseudo−second−order model, and rate constants were evaluated. Non-linear fit of adsorption isotherm, q_e vs C_e, were S−class for adsorption of both dye onto AL−PILC, indicating the heterogeneity of the adsorbent surface which leaded to a multilayer adsorption with interactions between dye molecules. Langmuir and Freundlich models were the best fits to the experimental data with the maximum adsorption capacities of AL−PILC for AR14 and BV3 dyes of 1.4 mg g^-1 and 3.0 mg g^-1, respectively. Lower adsorption capacities calculated from Langmuir isotherm model than the experimental values indicated adsorption mechanism occurs by multilayer formation on the adsorbent surface.

Published in	Modern Chemistry (Volume 8, Issue 2)
DOI	10.11648/j.mc.20200802.12
Page(s)	23-32
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Pillared Clay, Acid Red 14, Basic Violet 3, Kinetic Studies, Adsorption Isotherms

References

[1]	B. Lellis, C. Z. F.-Polonio, J. A. Pamphile, J. C. Polonio, (2019). "Effects of textile dyes on health and the environment and bioremediation potential of living organisms," Biotechnology Research and Innovation, in press.
[2]	X. Rong, F. Qiu, C. Zhang, L. Fu, Y. Wang, D. Yan, (2015), "Adsorption–photodegradation synergetic removal of methylene blue from aqueous solution by NiO/graphene oxide nanocomposite", Powder Technology, in press.
[3]	H. B. Mansour, O. Boughzala, D. Dridi, D. Barillier, L. Chekir-Ghedira, R. Mosrati, (2011), " Les colorants textiles sources de contamination de l’eau: CRIBLAGE de la toxicité et des méthodes de traitement", Journal of Water Science, vol. 24, n° 3, 209-238.
[4]	J. Chen, Y. Xiong, M. Duan, X. Li, Jun Li, S. Fang, S. Qin, R. Zhang, (2020), "Insight into the Synergistic Effect of Adsorption−Photocatalysis for the Removal of Organic Dye Pollutants by Cr-Doped ZnO", Langmuir, 35, 520-530.
[5]	K. Chinoune, K. Bentaleb, Z. Bouberka, A. Nadim, U. Maschke, (2016), "Adsorption of reactive dyes from aqueous solution by dirty bentonite," Applied Clay Science, 123: 64–75.
[6]	C. R. Sílvia Santos, A. R. Rui Boaventura, (2016), "Adsorption of cationic and anionic azo dyes on sepiolite clay: Equilibrium and kinetic studies in batch mode, Journal of Environmental Chemical Engineering, 4: 1473–1483.
[7]	F. Güzel, H. Saygili, G. A Saygili, F. Koyuncu, (2014), "Elimination of anionic dye by using nanoporous carbon prepared from an industrial biowaste", Journal of Molecular Liquid, 194: 130–140.
[8]	A. S. Abdulhameed, A. H. Jawad, A.-T. Mohammad, (2019), "Synthesis of chitosan-ethylene glycol diglycidyl ether/TiO₂ nanoparticles for adsorption of reactive orange 16 dye using a response surface methodology approach", Bioresource Technology 293: 122071.
[9]	V. Sharma, P. Rekha, P. Mohanty, (2016), " Nanoporous hypercrosslinked polyaniline: An efﬁcient adsorbent for the adsorptive removal of cationic and anionic dyes", Journal of Molecular Liquids 222: 1091–1100.
[10]	M. H. Dehghani, M. Mohammadi, G. Mckay, (2016), "Equilibrium and Kinetic studies of of Trihalomethanes Adsorption onto Multiwalled Carbon Nanotubes", Water, Air, & Soil Pollution, 227: 332.
[11]	T. S. Anirudhan and M. Ramachandran, (2015), " Adsorptive removal of basic dyes from aqueous solutions by surfactant modiﬁed bentonite clay (organoclay): Kinetic and competitive adsorption isotherm", Process Safety and Environmental Protection, 9 5: 215–225.
[12]	R. Gottipati, S. Mishra, (2016), "Preparation of microporous activated carbon from Aegle Marmelos fruit shell and its application in removal of chromium (VI) from aqeous phase", Journal of Industrial and Engineering Chemistry, 36: 355−363.
[13]	A. Ariful, I. Tariqul, C. I. Hernandez, M. L. Curry, (2018), "Adsorptive Ramoval of Sulfamethoxazole and Bisphenol A from contaminated Water using Functionalized Carbonaceous Material Derived from Tea Leaves", Journal of Environmental Chemical Engineering, 6 (4).
[14]	B. Makhoukhi, M. Djab, M. A. Didi, (2015), “Adsorption of Telon dyes onto bis-imidazolium modified bentonite in aqueous solutions", Journal of Environmental Chemical Engineering, 3: 1384–1392.
[15]	Li Wang and A. Wang, (2008), "Adsorption properties of Congo Red from aqueous solution onto surfactant-modiﬁed montmorillonite", Journal of Hazardous Materials 160 (2008) 173–180.
[16]	M. Harouna, R. Djakba, J. P. Nguetnkam, B. B. Loura, D. N Ileana., J. M. Ketcha, (2015), "Adsorption of Mn²⁺ and Zn²⁺ in Aqueous Solution by Using Aluminum Pillared Clay from Boboyo (Far North Cameroon)", American Chemical Science Journal, 5 (1): 94−104.
[17]	C. Tcheka, R. P. Chicinas, A. Maicaneanu, P. N. Fotsing, H. Moussout, R Domga, (2018), "Tetra-n-butylammonium Bromide (TBAB) Modified Cameroonian Local Clay Material for Adsorption of Crystal Violet Dye from Aqueous Solution", Submitted to Advancements in Materials, 2: 1-16.
[18]	S. Yamanaka, G. W. Brindley, (1979), "High surface area solids obtained by reaction of montmorillonite with zirconyl chloride", Clays and Clay Minerals, Vol. 27, No. 2: 119-124.
[19]	I. Khedher, A. Ghorbel, J. A. Mayoral, J. M. Fraile, "Physicochemical characterization of vanadium-doped alumina-pillared montmorillonite catalyst: Epoxidation of trans-2-hexen-1-ol", C. R. Chimie 12: 787−792.
[20]	L. G. Yan, L. L. Qin, H. Q. Yu, S. Li, R. R. Shan, B. Du, (2015), "Adsorption of acid dyes from aqueous solution by CTMAB modiﬁed bentonite: Kinetic and isotherm modeling", Journal of Molecular Liquids 211: 1074–1081.
[21]	H. Sadki, K. Ziat, M. Saidi, (2014), "Adsorption of dyes on activated local clay in aqueous solution", Journal of Materials and Environmental Science, 5: 2060−2065.
[22]	F. Zermane, M. Baudu, (2015), "Influence of humic acids on the adsorption of Basic Yellow 28 dye onto an iron organo-inorgano pillared clay and two Hydrous Ferric Oxides", Journal of Industrial and Ingineering Chemistry, 25: 229−238.
[23]	M. K. Dahri, M. R. Rahimi Kooh, B. L. Linda Lim, (2014), " Water remediation using low cost adsorbent walnut shell for removal of malachite green: Equilibrium, kinetics, thermodynamic and regeneration studies" Journal of Environmental Chemical Engineering 2: 1434–1444.
[24]	L. C. Cotet, A. Maicaneanu, (2013), “AlphA-Cypermetrin Pesticide Adsorption on Carbon Aerogel Aerogel and Xerogel.” Sci. Technol. 37–41.
[25]	P. N. Fotsing, E. D. Woumfo, S. A. Maicaneanu, J. Vieillard, C. Tcheka, P. T. Ngueagni, Jean M. Siéwé, (2020), " Removal of Cu(II) from aqueous solution using a composite made from cocoa cortex and sodium alginate", Environmental Science and Pollution Research, https://doi.org/10.1007/s11356-019-07206-3.
[26]	R. Elmoubarki, F. Z. Mahjoubi, H. Tounsadi, J. Moustadraf, M. Abdennouri, A. Zouhri,, A. El Albani, N. Barka, (2015), " Adsorption of textile dyes on raw and decanted Moroccan clays: Kinetics, equilibrium and thermodynamics", Water Resources and Industry, 9: 16–29
[27]	S. Arellano-Cárdenas, S. López-Cortez, M. Cornejo-Mazón, J. C. Mares-Gutiérrez, (2013), "Study of malachite green adsorption by organically modiﬁed clay using a batch method", Applied Surface Science, 280: 74–78.
[28]	A. A. Adeyemo, I. O. Adeoye, O. S. Bello, (2015), "Adsorption of dyes using different types of clay: a review", Appl Water Sci (2017) 7: 543–568.
[29]	S. A. Yahya, M. I. El-Barghouthi, A. H. El-Sheikh, G. M. Walker, (2007), "Effect of Solution pH, Ionic Strength, and Temperature on Adsorption Behavior of Reactive Dyes on Activated Carbon", Dyes and pigments, p. 8.
[30]	S. Lagergren, (1898), Kungliga Svenska Vetenskapsakad Handl, 24: 1–39.
[31]	Y. S. HO and G. MCKAY, (1998), "Kinetic Models for the Sorption of Dye from Aqueous Solution by Wood", Trans IChemE, Vol 76, Part B.
[32]	C. Xia, Y. Jing, Y. Jia, D Yue, J. Ma, X. Yin, (2011), " Adsorption properties of Congo Red from aqueous solution on modiﬁed hectorite: Kinetic and thermodynamic studies", Desalination 265: 81–87.
[33]	J. W. J. Weber, J. C. Morris, (1963), J Sanit Eng Div Proceed Am Soc Civil Eng, 89: 31–59.
[34]	W. H. Cheung, Y. S. Szeto, G. McKay, (2007), Bioresour. Technol., 98: 2897–2904.
[35]	C H. Giles, D. Smith, (1974), "A General Treatment and Classification of the Solute Adsorption Isotherm I. Theoretical", Journal of Colloid and Interface Science, Vol. 47, No. 3.
[36]	A. Djelad, A. Mokhtar, A Khelifa, A. Bengueddach, M. Sassi, (2019), "Alginate-whey an effective and green adsorbent for crystal violet removal: Kinetic, thermodynamic and mechanism studies", International Journal of Biological Macromolecules, in press.
[37]	I. Langmuir J Am Chem Soc, 38 (1916). 2221-2295.
[38]	Bike M., Etude Physico-Chimique de la Décoloration du Beurre de Karité et de l’Huile de Palme par le Charbon Actif de Coques de Noix de Pamiste et Trois Facteurs de Vertissol, Thèse de Doctorat Ecole Nationale Supérieur d’Agroindustrie, Université de Ngaoundéré, (2010) 237p.
[39]	J. S. Piccin, L. Dotto, L. A. A. Pinto, (2011), " Adsorption Isotherms and Thermochemical Data of Fd&C Red N° 40 Binding by Chitosan", Brazilian Journal of Chemical Engineering, Vol. 28, No. 02, pp. 295-304.
[40]	Saoud G., "Etude de la Carbonisation d’un Précursseur Végétal, les Noyaux d’Olive: Utilisation dans le Traitement des Eaux", Mémoire de Master, Université Skikida Algérie, (2008) 195p.
[41]	M. Kessoum, O. C. Caqueret, B. Cagnon, S. Bostyn,, "Etude Cinétique et Thermodynamique de l’Adsorption des Composés Phénoliques en mono Soluté et Mélange de Charbon Actif", Journal of Water, vol. 3, (2008) p66-p72.
[42]	N. T. Hai, Y. Sheng-Jie, H. Ahmad, C. Huan-Ping, (2017), "Mistakes and Inconsistencies Regarding Adsorption of Aontaminants from Aqueous Solution: A Critical Review", Wather Research, 10-17.
[43]	Bouanimba N., "Modélisation et Optimisation de la Cinétique de Degradation Photocatalytique de Polluants Organiques en Solution Aqueuse", (2009), Mémoire de Master en Chimie, Faculté des Sciences, Université Mentouri- Constantine, 195p.

Cite This Article

Plain Text BibTeX RIS

APA Style

Massai Harouna, Constant Tcheka, Narcisse Dobe. (2020). Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium. Modern Chemistry, 8(2), 23-32. https://doi.org/10.11648/j.mc.20200802.12

Copy | Download

ACS Style

Massai Harouna; Constant Tcheka; Narcisse Dobe. Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium. Mod. Chem. 2020, 8(2), 23-32. doi: 10.11648/j.mc.20200802.12

Copy | Download

AMA Style

Massai Harouna, Constant Tcheka, Narcisse Dobe. Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium. Mod Chem. 2020;8(2):23-32. doi: 10.11648/j.mc.20200802.12

Copy | Download

@article{10.11648/j.mc.20200802.12,
  author = {Massai Harouna and Constant Tcheka and Narcisse Dobe},
  title = {Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium},
  journal = {Modern Chemistry},
  volume = {8},
  number = {2},
  pages = {23-32},
  doi = {10.11648/j.mc.20200802.12},
  url = {https://doi.org/10.11648/j.mc.20200802.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.mc.20200802.12},
  abstract = {The present work report removal of acid red 14 (AR14) and basic violet 3 (BV3) as anionic and cationic dyes, respectively, by adsorption process in batch mode from aqueous solution onto natural and modified forms of a local Cameroonian clay. The efficiency of these adsorbents materials (purified natural clay, P−Clay, sodium−clay, Na−Clay, and aluminium−pillared, Al−PILC) to remove dyes from aqueous medium was examined at different initial concentrations, pH, and ionic strengths. At the optimal contact time of 20 minutes, the maximum adsorbed dye amount on various adsorbents was obtained at pH 9 and pH 3 for AR14 and BV3 dyes, respectively. Adsorption process of both dyes on purified or modified clay was pH depend and the dyes molecules sorption over the clay surface occurs by electrostatic interactions. Ionic strength influenced significantly AR14 and BV3 dyes adsorption. Homo-ionization and pillaring clay increased its adsorption capacity. Kinetic studies showed that adsorption follows a pseudo−second−order model, and rate constants were evaluated. Non-linear fit of adsorption isotherm, qe vs Ce, were S−class for adsorption of both dye onto AL−PILC, indicating the heterogeneity of the adsorbent surface which leaded to a multilayer adsorption with interactions between dye molecules. Langmuir and Freundlich models were the best fits to the experimental data with the maximum adsorption capacities of AL−PILC for AR14 and BV3 dyes of 1.4 mg g-1 and 3.0 mg g-1, respectively. Lower adsorption capacities calculated from Langmuir isotherm model than the experimental values indicated adsorption mechanism occurs by multilayer formation on the adsorbent surface.},
 year = {2020}
}

Copy | Download

TY  - JOUR
T1  - Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium
AU  - Massai Harouna
AU  - Constant Tcheka
AU  - Narcisse Dobe
Y1  - 2020/08/27
PY  - 2020
N1  - https://doi.org/10.11648/j.mc.20200802.12
DO  - 10.11648/j.mc.20200802.12
T2  - Modern Chemistry
JF  - Modern Chemistry
JO  - Modern Chemistry
SP  - 23
EP  - 32
PB  - Science Publishing Group
SN  - 2329-180X
UR  - https://doi.org/10.11648/j.mc.20200802.12
AB  - The present work report removal of acid red 14 (AR14) and basic violet 3 (BV3) as anionic and cationic dyes, respectively, by adsorption process in batch mode from aqueous solution onto natural and modified forms of a local Cameroonian clay. The efficiency of these adsorbents materials (purified natural clay, P−Clay, sodium−clay, Na−Clay, and aluminium−pillared, Al−PILC) to remove dyes from aqueous medium was examined at different initial concentrations, pH, and ionic strengths. At the optimal contact time of 20 minutes, the maximum adsorbed dye amount on various adsorbents was obtained at pH 9 and pH 3 for AR14 and BV3 dyes, respectively. Adsorption process of both dyes on purified or modified clay was pH depend and the dyes molecules sorption over the clay surface occurs by electrostatic interactions. Ionic strength influenced significantly AR14 and BV3 dyes adsorption. Homo-ionization and pillaring clay increased its adsorption capacity. Kinetic studies showed that adsorption follows a pseudo−second−order model, and rate constants were evaluated. Non-linear fit of adsorption isotherm, qe vs Ce, were S−class for adsorption of both dye onto AL−PILC, indicating the heterogeneity of the adsorbent surface which leaded to a multilayer adsorption with interactions between dye molecules. Langmuir and Freundlich models were the best fits to the experimental data with the maximum adsorption capacities of AL−PILC for AR14 and BV3 dyes of 1.4 mg g-1 and 3.0 mg g-1, respectively. Lower adsorption capacities calculated from Langmuir isotherm model than the experimental values indicated adsorption mechanism occurs by multilayer formation on the adsorbent surface.
VL  - 8
IS  - 2
ER  -

Copy | Download

Author Information

Massai Harouna

Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon
Constant Tcheka

Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon
Narcisse Dobe

Faculty of Science, University of Maroua, Maroua, Cameroon

Download PDF

Sections

Plain Text BibTeX RIS

APA Style

Massai Harouna, Constant Tcheka, Narcisse Dobe. (2020). Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium. Modern Chemistry, 8(2), 23-32. https://doi.org/10.11648/j.mc.20200802.12

Copy | Download

ACS Style

Massai Harouna; Constant Tcheka; Narcisse Dobe. Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium. Mod. Chem. 2020, 8(2), 23-32. doi: 10.11648/j.mc.20200802.12

Copy | Download

AMA Style

Massai Harouna, Constant Tcheka, Narcisse Dobe. Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium. Mod Chem. 2020;8(2):23-32. doi: 10.11648/j.mc.20200802.12

Copy | Download

@article{10.11648/j.mc.20200802.12,
  author = {Massai Harouna and Constant Tcheka and Narcisse Dobe},
  title = {Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium},
  journal = {Modern Chemistry},
  volume = {8},
  number = {2},
  pages = {23-32},
  doi = {10.11648/j.mc.20200802.12},
  url = {https://doi.org/10.11648/j.mc.20200802.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.mc.20200802.12},
  abstract = {The present work report removal of acid red 14 (AR14) and basic violet 3 (BV3) as anionic and cationic dyes, respectively, by adsorption process in batch mode from aqueous solution onto natural and modified forms of a local Cameroonian clay. The efficiency of these adsorbents materials (purified natural clay, P−Clay, sodium−clay, Na−Clay, and aluminium−pillared, Al−PILC) to remove dyes from aqueous medium was examined at different initial concentrations, pH, and ionic strengths. At the optimal contact time of 20 minutes, the maximum adsorbed dye amount on various adsorbents was obtained at pH 9 and pH 3 for AR14 and BV3 dyes, respectively. Adsorption process of both dyes on purified or modified clay was pH depend and the dyes molecules sorption over the clay surface occurs by electrostatic interactions. Ionic strength influenced significantly AR14 and BV3 dyes adsorption. Homo-ionization and pillaring clay increased its adsorption capacity. Kinetic studies showed that adsorption follows a pseudo−second−order model, and rate constants were evaluated. Non-linear fit of adsorption isotherm, qe vs Ce, were S−class for adsorption of both dye onto AL−PILC, indicating the heterogeneity of the adsorbent surface which leaded to a multilayer adsorption with interactions between dye molecules. Langmuir and Freundlich models were the best fits to the experimental data with the maximum adsorption capacities of AL−PILC for AR14 and BV3 dyes of 1.4 mg g-1 and 3.0 mg g-1, respectively. Lower adsorption capacities calculated from Langmuir isotherm model than the experimental values indicated adsorption mechanism occurs by multilayer formation on the adsorbent surface.},
 year = {2020}
}

Copy | Download

TY  - JOUR
T1  - Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium
AU  - Massai Harouna
AU  - Constant Tcheka
AU  - Narcisse Dobe
Y1  - 2020/08/27
PY  - 2020
N1  - https://doi.org/10.11648/j.mc.20200802.12
DO  - 10.11648/j.mc.20200802.12
T2  - Modern Chemistry
JF  - Modern Chemistry
JO  - Modern Chemistry
SP  - 23
EP  - 32
PB  - Science Publishing Group
SN  - 2329-180X
UR  - https://doi.org/10.11648/j.mc.20200802.12
AB  - The present work report removal of acid red 14 (AR14) and basic violet 3 (BV3) as anionic and cationic dyes, respectively, by adsorption process in batch mode from aqueous solution onto natural and modified forms of a local Cameroonian clay. The efficiency of these adsorbents materials (purified natural clay, P−Clay, sodium−clay, Na−Clay, and aluminium−pillared, Al−PILC) to remove dyes from aqueous medium was examined at different initial concentrations, pH, and ionic strengths. At the optimal contact time of 20 minutes, the maximum adsorbed dye amount on various adsorbents was obtained at pH 9 and pH 3 for AR14 and BV3 dyes, respectively. Adsorption process of both dyes on purified or modified clay was pH depend and the dyes molecules sorption over the clay surface occurs by electrostatic interactions. Ionic strength influenced significantly AR14 and BV3 dyes adsorption. Homo-ionization and pillaring clay increased its adsorption capacity. Kinetic studies showed that adsorption follows a pseudo−second−order model, and rate constants were evaluated. Non-linear fit of adsorption isotherm, qe vs Ce, were S−class for adsorption of both dye onto AL−PILC, indicating the heterogeneity of the adsorbent surface which leaded to a multilayer adsorption with interactions between dye molecules. Langmuir and Freundlich models were the best fits to the experimental data with the maximum adsorption capacities of AL−PILC for AR14 and BV3 dyes of 1.4 mg g-1 and 3.0 mg g-1, respectively. Lower adsorption capacities calculated from Langmuir isotherm model than the experimental values indicated adsorption mechanism occurs by multilayer formation on the adsorbent surface.
VL  - 8
IS  - 2
ER  -

Copy | Download